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HUBBLE SPACE TELESCOPE

DAILY REPORT #2437

PERIOD COVERED: 0000Z (UTC) 08/16/99 - 0000Z (UTC) 08/17/99

Daily Status Report as of 229/0000Z

1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED:

1.1 Completed STIS/CCD 8408 (STIS CCD Dark Monitor C8)

The Space Telescope Imaging Spectrograph (CCD) was used to make a CCD
bias calibration observation. This is to monitor the darks for the STIS CCD.
The observations were executed as scheduled, and no anomalies were reported.

1.2 Completed Five Sets of WF/PC-2 8442 (WF/PC-2 Cycle 8 Standard Darks)

The WF/PC-2 was used to make a series of Cycle 8 standard dark
calibration observations. This dark calibration program obtains dark frames
every week in order to provide data for the ongoing calibration of the CCD dark
current rate, and to monitor and characterize the evolution of hot pixels. The
observations were executed as scheduled, and no anomalies were noted.

1.3 Completed FGS 8292 (Calibrating the Mass-Luminosity Relation at the End
of the Main Sequence)

The Fine Guidance Sensor (FGS1R) was used to make astrometric
observations of the star GJ1081 and other nearby reference stars. This is part
of a study to calibrate the mass-luminosity relation for stars less massive
than 0.2 Msun, with special emphasis on objects near the stellar/brown dwarf
border. The observations were completed as planned, and no problems were
reported.

1.4 Completed STIS/CCD 8409 (STIS CCD Bias Monitor C8)

The Space Telescope Imaging Spectrograph (CCD) was used to make a CCD
bias calibration observation. This is to monitor the bias in the 1x1, 1x2,
2x1, and 2x2 bin settings at gain=1, and 1x1 at gain = 4, to build up high-S/N
superbiases and to track the evolution of hot columns. The observations were
executed as scheduled, and no anomalies were reported.

1.5 Completed WF/PC-2 7495 (Survey of Gravitational Lenses as Cosmological
Tools)

The WF/PC-2 was used to make survey observations of object FBQ1633+31 by
obtaining deep, high-resolution images in the optical and near IR in order to
see if it is gravitationally lensed and could be used as a cosmological tool.
The observations were executed as scheduled, and no anomalies were noted.

1.6 Completed Three Sets of STIS/CCD 8406 (POMS Test Proposal: STIS
Non-Scripted Parallel Proposal Continuation V)

The Space Telescope Imaging Spectrograph (CCD) was used to make high
galactic latitude observations taken in parallel with the prime science
observations as part of a POMS proposal. This is a STIS non-scripted parallel
Condition V proposal. During the second iteration of this proposal, the loss
of lock described in 2.1 and HSTAR 7218 occurred, affecting one observation.
Otherwise, the observations were completed as scheduled, and no further
anomalies were reported.

1.7 Completed STIS/CCD 8202 (Bright Quasar Close Lensing Search)

The Space Telescope Imaging Spectrograph (CCD) was used to make
observations of HCLQ1530+3 as part of a second generation survey to search for
bright lensing quasars. With the restored PSF, new images will be considerably
more sensitive to the presence of both close separation and faint lens
components, and because STIS reaches two magnitudes fainter the PC, the new
snapshot images will have much greater dynamic range. The observations were
executed as scheduled, and no anomalies were noted.

1.8 Completed WF/PC-2 8181 (Resolving Sirius-like Binaries)

The WF/PC-2 was used to make observations of the star 63ERI in order to
try and resolve these Sirius-like binary star systems. Subsequent
determinations of the visual orbits of the resolved binaries with the HST will
provide dynamical measurements of the white-dwarf masses. The observations
were completed as scheduled, and no anomalies were reported.

1.9 Completed STIS/CCD/MA2 8225 (Absorption and Obscuration in Radio-Loud
Quasars)

The Space Telescope Imaging Spectrograph (CCD and MA1) was used to make
observations of the radio-loud quasar MRCO450-22. The role of associated
absorption systems and dust obscuration close to the central engines of AGN is
not understood. The observations were completed as planned, and no anomalies
were reported.

1.10 Completed WF/PC-2 8090 (POMS Test Proposal: WF-II Parallel Archive
Proposal Continuation)

The WF/PC-2 was used in the parallel mode to make some low galactic
latitude archive observations. The program will be used to take parallel
images of random areas of the sky. The observations were executed as
scheduled, and no anomalies were noted.

1.11 Completed STIS/MA1 7769 (Spectro Imaging of the Jovian Aurora)

The Space Telescope Imaging Spectrograph (MA1) was used to make
spectrographic images of the aurora of the planet Jupiter. Observations were
also made of its moon Europa. The primary interest is the diagnostic of the
Lyman-alpha emission in several particular regions of the Jovian auroral
region, together with records of the H-2 Lyman and Werner emission which is
necessary for its interpretation. The observations were completed as planned
and no anomalies were noted.

1.12 Completed Two Sets of STIS/MA1 8426 (Cycle 8 MAMA Dark Measurements)

The Space Telescope Imaging Spectrograph (MA1) was used to make a
routine Cycle-8 MAMA dark noise calibration measurement. This proposal will
provide the primary means of checking on the health of the MAMA detectors.
This is done through frequent monitoring of the background count rate. The
observations were completed as planned, and no problems were reported.

1.13 Completed WF/PC-2 6671 (Deep V, I Photometry for 20 M31 Globular
Clusters)

The WF/PC-2 was used to make deep photometry observations (V=27.5) of
the globular cluster M-31- G87 which is located in the Andromeda Galaxy
(a.k.a., M-31). During this proposal, the loss of lock described in 2.1 and
HSTAR 7218 occurred, affecting one observation. Otherwise, the observations
were executed as planned, and no further problems were reported.

1.14 Completed STIS/CCD 7912 (STIS Parallel Archive Proposal - Nearby
Galaxies - Imaging and Spectroscopy)

The Space Telescope Imaging Spectrograph (CCD) was used to make parallel
observations of nearby galaxies. This survey will be useful to study the star
formation histories, chemical evolution, and distances to these galaxies.
These data will be placed immediately into the Hubble Data Archive. The
observations were completed as scheduled, and no problems were reported.

1.15 Completed STIS/CCD 8080 (STIS Spectroscopic CCD Flatfielding --
Revised)

The Space Telescope Imaging Spectrograph (CCD) was used to make CCD flat
fielding calibration observations in the spectroscopic mode. The observations
were completed as planned, and no anomalies were reported.

1.16 Completed WF/PC-2 8345 (Multipolar Bubbles and Jets in Very Low
Excitation Planetary Nebulae - A WF/PC-2 H-Alpha Imaging Survey)

The WF/PC-2 was used to make H-Alpha observations of the very low
excitation planetary nebula PK223-04D1 in order to study its multipolar bubbles
and jets. Comparison of the morphology of this young PNe sample with more
evolved PNe populations will set new constraints on models for the production
of jet-like outflows and nebular evolution. The observations were completed as
planned, and no problems were reported.

2.0 FLIGHT OPERATIONS SUMMARY:

2.1 Guide Star Acquisitions:

Scheduled Acquisitions: 9
Successful: 9
Scheduled Re-acquisitions: 6
Successful: 6

Per HSTAR 7218, there was a loss of lock on FGSs 1 and 2 at 228/194634Z,
affecting the proposals described in 1.6 and 1.13 above.

2.2 FHST Updates:

Scheduled: 23
Successful: 23

2.3 Operations Notes:

The SSR EDAC error counter was cleared twice per ROP SR-1.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

Continuation of normal science observations and calibrations.

/DMH